<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<style>
  
</style>
<body>
  <div id="app">
 <ul>
    <li v-for="(item, index) in random" :key="index">{{item.number}}
        <button @click="del(index)">删除</button>
    </li>
    
 </ul>
 <button @click="add(index)">添加数字</button>
  </div>

   <script src="../vue.js"></script>
   <script>
    const app = new Vue({
      el: '#app',
      data: {
     random:[]
      },
      methods: {
       add(){
        this.random.push({
          number: Math.floor(Math.random() * 20)
        });
       },
       del(index){
        this.random.splice(index,1)
       }
       }
       }
      
    )
  </script>
</body>
</html>